You can take steps to improve and maintain the healthy diversity of your gut microbiome: Reduce intake of added sugars and processed grains. These foods provide very rapid energy sources for some bacteria, which may crowd out others and decrease the diversity and health of your gut microbiota.

Lactose intolerance: The inability to digest lactose, a component of milk and some other dairy products. The basis for lactose intolerance is the lack of an enzyme called lactase in the small intestine. The most common symptoms of lactose intolerance are diarrhea, bloating, and gas